The address of an integer to receive the value following the rf=, a value (a bitmap) of:
DMARC_RECORD_RF_UNSPECIFIED if the rf= was absent or if no ruf= was specified.
DMARC_RECORD_RF_AFRF if rf=afrf.
DMARC_RECORD_RF_IODEF if rf=iodef.

RETURN VALUES

DMARC_PARSE_OKAY -- On success.

DMARC_PARSE_ERROR_EMPTY -- The pctp pointer was NULL.

DMARC_PARSE_ERROR_NULL_CTX -- If you passed in a rf pointer value that was NULL.